[LLVMbugs] [Bug 2773] New: Define __USER_LABEL_PREFIX__

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2773

           Summary: Define __USER_LABEL_PREFIX__
           Product: clang
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: preprocessor
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: daniel at zuster.org
                CC: llvmbugs at cs.uiuc.edu


This is used by some glibc headers.

From:
http://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html#Common-Predefined-Macros
--
__USER_LABEL_PREFIX__
    This macro expands to a single token which is the prefix applied to user
labels (symbols visible to C code) in assembly. For example, in the m68k-aout
environment it expands to an `_', but in the m68k-coff environment it expands
to nothing.

    This macro will have the correct definition even if -f(no-)underscores is
in use, but it will not be correct if target-specific options that adjust this
prefix are used (e.g. the OSF/rose -mno-underscores option). 
--


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